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Observing strain glass transition in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)high entropy alloy with Elinvar effect

Journal of Materials Science & Technology 2024年第1期168卷 16-23页

作者： Kaichao Zhang Kai Wang Bin Wang Chao Lv Jiaxing Zheng Guanqi Li Yu Fu Wenlong Xiao Qingqing Cai Xutao Nie Yingfeng Shao Huilong Hou xinqing zhao School of Materials Science and Engineering Beihang UniversityBeijing 100191China China Aerodynamics Research and Development Center Mianyang 621000China State Key Laboratory of Nonlinear Mechanics Chinese Academy of SciencesInstitute of MechanicsBeijing 100190China Tianmushan Laboratory(Zhejiang Provincial Laboratory for Aviation) Hangzhou 310000China

Exploring the phase transition of high entropy alloys(HEAs)with multiple major elements is of great importance for understanding the underlying physical mechanisms.Macroscopic martensitic phase tran-sition has been frequently reported in HEAs,however,nanoscale microstructural phase evolution has not been investigated to the same extent.Herein,we have prepared the Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA and investi-gated the strain glass transition and its associated properties using dynamic mechanical analysis and mi-crostructure characterization.We have found that the elastic modulus in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA deviates from Wachtman’s equation and observed the Elinvar effect in the form of temperature-independent mod-ulus in the temperature range from 150 K to 450 K and frequency-dependence modulus around 220 K.The strain glass transition has been evidenced in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA by the formation and growth of nano-sized domains during in-situ transmission electron microscopy(TEM)cooling,and substantiated by the broken ergodicity during zero-field-cooling/field-cooling.The strain glass transition is believed to account for the Elinvar effect,where the modulus hardening of nano-sized domains compensates dynam-ically with the modulus softening of the transformable matrix.

关键词： High entropy alloys Strain glass transition Elinvar effect Microstructural evolution Nanodomains

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High thermal conductivity and high strength magnesium alloy for high pressure die casting ultrathin-walled components

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 88-96页

作者： Jian Rong Wenlong Xiao xinqing zhao Chaoli Ma Haimiao Liao Donglei He Ming Chen Meng Huang Chen Huang Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang UniversityBeijing 100191China Dongguan Qingniao Metal Material Co. Ltd.Dongguan 523000China Structural Technology Department Hardware Technology CenterOPPO Guangdong Mobile Communications Co.Ltd.Dongguan 523000China

With the rapid development of 3C industries,the demand for high-thermal-conductivity magnesium alloys with high mechanical performance is increasing quickly.However,the thermal conductivities of most common Mg foundry alloys(such as Mg-9wt%-1wt%Zn)are still relatively low.In this study,we developed a high-thermal-conductivity Mg-4Al-4Zn-4RE-1Ca(wt%,AZEX4441)alloy with good mechanical properties for ultrathin-walled cellphone components via high-pressure die casting(HPDC).The HPDC AZEX4441 alloy exhibited a fine homogeneous microstructure(average grain size of 2.8μm)with granular Al_(11)RE_(3),fibrous Al_(2)REZn_(2),and networked Ca_(6)Mg_(2)Zn_(3) phases distributed at the grain boundaries.The room-temperature thermal conductivity of the HPDC AZEX4441 alloy was 94.4 W·m^(-1)·K^(-1),which was much higher than 53.7 W·m^(-1)·K^(-1) of the HPDC AZ91D alloy.Al and Zn in the AZEX4441 alloy were largely consumed by the formation of Al_(11)RE_(3),Al_(2)REZn_(2),and Ca_(2)Mg_(6)Zn_(3) phases because of the addition of RE and Ca.Therefore,the lattice distortion induced by solute atoms of the AZEX4441 alloy(0.171%)was much lower than that of the AZ91D alloy(0.441%),which was responsible for the high thermal conductivity of the AZEX4441 alloy.The AZEX4441 alloy exhibited a high yield strength of~185 MPa,an ultimate tensile strength of~233 MPa,and an elongation of~4.2%.This result indicated that the tensile properties were comparable with those of the AZ91D alloy.Therefore,this study contributed to the development of high-performance Mg alloys with a combination of high thermal conductivity,high strength,and good castability.

关键词： magnesium alloys microstructure thermal conductivity mechanical properties high-pressure die casting

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Genome mining reveals the biosynthetic potential of the marinederived strain Streptomyces marokkonensis M10

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Synthetic and Systems Biotechnology 2016年第1期1卷 56-65页

作者： Liangyu Chen Ying-Mi Lai Yu-Liang Yang xinqing zhao School of Life Science and Biotechnology Dalian University of TechnologyDalian 116024China Agricultural Biotechnology Research Center Academia SinicaTaipei 11529Taiwan State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology Shanghai Jiao Tong UniversityShanghai 200240China

Marine streptomycetes are rich sources of natural products with novel structures and interesting biological activities,and genome mining of marine streptomycetes facilitates rapid discovery of their useful products.In this study,a marine-derived Streptomyces sp.M10 was revealed to share a 99.02%16S rDNA sequence identity with that of Streptomyces marokkonensis Ap1T,and was thus named S.marokkonensis M10.To further evaluate its biosynthetic potential,the 7,207,169 bps of S.marokkonensis M10 genome was sequenced.Genomic sequence analysis for potential secondary metaboliteassociated gene clusters led to the identification of at least three polyketide synthases(PKSs),six non-ribosomal peptide synthases(NRPSs),one hybrid NRPS-PKS,two lantibiotic and five terpene biosynthetic gene clusters.One type I PKS gene cluster was revealed to share high nucleotide similarity with the candicidin/FR008 gene cluster,indicating the capacity of this microorganism to produce polyene macrolides.This assumption was further verified by isolation of two polyene family compounds PF1 and PF2,which have the characteristic UV adsorption at 269,278,290 nm(PF1)and 363,386 and 408 nm(PF2),respectively.S.marokkonensis M10 is therefore a new source of polyene metabolites.Further studies on S.marokkonensis M10 will provide more insights into natural product biosynthesis potential of related streptomycetes.This is also the first report to describe the genome sequence of S.marokkonensis-related strain.

关键词： Streptomyces marokkonensis Genome mining Secondary metabolites Polyketide synthase Polyene macrolides

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Peculiar aging response of near β Ti-25 Nb-2Mo-4Sn alloy for biomedical applications

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Progress in Natural Science:Materials International 2013年第2期23卷 1-6页

作者： Shun Guo Bin Chen Qingkun Meng Ruiwen zhao xinqing zhao School of Materials Science and Engineering Beihang University

In this paper,aging response of a recently developed near β Ti-25Nb-2Mo-4Sn(wt%) alloy with high strength and low modulus was investigated intensively.The experimental results from X-ray diffraction and transmission electron microscopy showed that the aging production of the Ti-2524 alloy was(β+ω) or(β+α) even under the same aging treatment condition,depending on the pre-treatments prior to the aging.Solid evidence confirmed the competition between stable α phase and metastable ω phase during the decomposition of β phase on aging.Different aging response of Ti-2524 alloy can be attributed to high-density dislocations and grain boundaries which suppress the formation of ω,and alternatively promote a phase formation.This provides a thermo-mechanical approach to inhibit deleterious ω phase formation and assist fine α phase precipitation.Upon an appropriate aging treatment,superior mechanical properties of high ultimate tensile strength(1233 MPa) and low elastic modulus(77 GPa) were achieved in Ti-2524 alloy.

关键词： Near β titanium alloy Phase transformation Mechanical properties High strength Low modulus

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A β-type TiNbZr alloy with low modulus and high strength for biomedical applications

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Progress in Natural Science:Materials International 2014年第2期24卷 157-162页

作者： Qingkun Meng Shun Guo Qing Liu Liang Hu xinqing zhao School of Materials Science and Engineering Beihang University Institute for Advanced Materials Jiangsu University

The effect of thermo-mechanical treatment on the mechanical properties of a novel β-type Ti–36Nb–5Zr(wt%) alloy has been investigated.The solution treated alloy consists of β and α″ phases and exhibits a two-stage yielding with a low yield stress(around 100 MPa). After cold rolling at a reduction of 87.5% and subsequent annealing treatment at 698 K for 25 min, a fine microstructure with nanosized α precipitates distributed in small β grains as well as high density of dislocations was obtained to achieve a yield strength of 720 MPa and a ultimate tensile strength of 860 MPa. In spite of the formation of α precipitates, the β-stabilizers are not enriched in the parent β matrix due to the short duration and low temperature of the thermal treatment, resulting in a low chemical stability of β phase. The low stability of β phase and the small volume fraction of α precipitates produce a low Young’s modulus of 48 GPa. Such an excellent combination of low elastic modulus and high strength in mechanical properties indicates great potential for biomedical applications.

关键词： β-type Ti alloy Ti–Nb–Zr Chemical stabilization Young’s modulus Biomedical

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Deformation induced Elinvar behavior in Fe-Ni Invar alloy

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Science Bulletin 2018年第16期63卷 1040-1042页

作者： Fangyu Qin Fengshuang Lu Yulin Chen Jianmin Yang xinqing zhao School of Materials Science and Engineering Beihang University Beijing 100191 China Functional Materials Research Institute. Central Iron and Steel Research Institute Beijing 100081. China

Fe-Ni alloys exhibiting temperature-independent elastic modulus(Elinvar)and thermal expansion(Invar)properties have found wide and significant applications,such as liquefied natural gas tanks,micrometers,reed relays,hairsprings,etc.[1].Owing to the technical and theoretical importance of Invar and Elinvar effects,the underlying mechanisms of such effects have been

关键词：钢合金行为液化天然气材料科学影响因素继电器试验性磁性

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Microstructural evolution and mechanical behavior of metastable β-type Ti–30Nb–1Mo–4Sn alloy with low modulus and high strength

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Progress in Natural Science:Materials International 2015年第5期25卷 414-418页

作者： Shun Guo Qingkun Meng Xiaonong Cheng xinqing zhao Institute for Advanced Materials Jiangsu University School of Materials Science and Engineering Beihang University

A metastable P-type Ti-30Nb-lMo-4Sn alloy with ultralow elastic modulus and high strength was fabricated.Under the solution treatment state,the Ti-30Nb-1Mo-4Sn alloy possesses low yield strength of about 130 MPa owing to the presence of the coarse α " martensitic laths.Upon a cold rolling and annealing process,the martensitic transformation from β to α" is significantly retarded due to the inhibitory effect of grain boundaries and dislocations.As a result,the metastable β phase with low total amount of β-stabilizers is retained to room temperature,giving rise to a low modulus of 45 GPa.Meanwhile,nano-sized a precipitates and dislocation tangles play a key role in strengthening the Ti-30Nb-1Mo-4Sn alloy,resulting in a high tensile strength of ~ 1000 MPa.With low elastic modulus and high strength,the metastable P-type Ti-30Nb-1Mo-4Sn alloy could be a potential candidate for biomedical materials.

关键词： Metastable β Ti alloy β stability Martensitic transformation Low modulus High strength

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Microstructure evolution and mechanical properties of Ti-8Nb-2Fe-0.2O alloy with high elastic admissible strain for orthopedic implant applications

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Progress in Natural Science:Materials International 2020年第1期30卷 100-105页

作者： Yu Fu Junshuai Wang Wenlong Xiao xinqing zhao Chaoli Ma Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang University Key Laboratory of High Temperature Structural Materials & Coatings Technology Ministry of Industry and Information TechnologyBeihang University

A Ti-8Nb-2Fe-0.2O(wt.%) alloy with high strength,high elastic admissible strain(δ) and low cost was designed using d-electron theory combined with electron-to-atom ratio(e/a) approach.Interstitial oxygen was introduced to strengthen the matrix of the alloy.The β-solution treated alloy was mainly composed of α " martensite with internal {111}type Ⅰ nano-twins.The α " martensite with hexagonal-like crystal structure caused by interstitial oxygen showed a high strength of 1.1 GPa but limited ductility.The alloy generated equiaxed fine-grained a phase embedded by β matrix via hot rolling and subsequent annealing in α+β phase field.The obtained alloy indicated a good combination of mechanical properties with ultimate tensile strength,Young’s modulus,ductility and δ value of 1029 MPa,74 GPa,21% tensile elongation and 1.32%,respectively.These findings demonstrate that interstitial oxygen and martensitic nano-twins can be used to strengthen the soft α" martensite and high elastic admissible strain can be obtained by formation of equiaxed fine-grained α phase embedded by βmatrix in this Ti-8Nb-2Fe-0.2O alloy for orthopedic implant.

关键词： Titanium alloy Oxygen Microstructure Strength Elastic admissible strain

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A novel strategy for developingα+βdual-phase titanium alloys with low Young's modulus and high yield strength

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Journal of Materials Science & Technology 2021年第17期76卷 122-128页

作者： Yu Fu Wenlong Xiao Junshuai Wang Lei Ren xinqing zhao Chaoli Ma Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang UniversityBeijing 100191China Yunnan Innovation Institute of Beihang University Kunming 650000China

In this study,a novel strategy for developingα+βdual-phase titanium alloys with low Young's modulus and high yield strength was proposed,and a Ti-15Nb-5Zr-4Sn-1 Fe alloy was developed through theoretical composition design and microstructure manipulation.After hot-rolling and subsequent annealing,a high volume fraction of ultrafine grainedαphase embedded in metastableβ-matrix was formed in the microstructure as intended.Consequently,this alloy exhibits both low Young's modulus(61 GPa)and high yield strength(912 MPa).The experimental results prove that the proposed strategy is appropriate for developing titanium alloys with superior yield strength-to-modulus ratio than those of conventional metallic biomedical materials.Present study might shed light on the research and development of advanced biomedical titanium alloys with low Young's modulus and high yield strength.

关键词： Titanium alloy α+βdual-phase Alloy design Phase stability Young's modulus

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α′TypeTi-Nb-Zralloyswithultra-lowYoung′smodulusandhighstrength

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Progress in Natural Science:Materials International 2013年第6期23卷 562-565页

作者： Qing Liu Qingkun Meng Shun Guo xinqing zhao School of Materials Science and Engineering Beihang University Institute for Advanced Materials Jiangsu University

a’ phase based Ti-Nb-Zr alloys with low Young’s modulus and high strength were prepared,and their microstructure and mechanical properties were characterized.It was revealed that the lattice expansion by Nb and Zr addition as well as the presence of a few of a" martensite might be responsible for the low modulus achieved.Ti-15Nb-9Zr alloy,with ultralow modulus of 39 GPa and high strength of850 MPa,could be a potential candidate for biomedical applications.

关键词： Titanium alloys Cold working α’ Martensite Biomaterials Mechanical properties

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